<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<button onclick="foo()">隔10s关闭页面</button>
		
		<button onclick="foo2()" id="btn2">倒数10s</button>
		<script>
			
			// setTimeout(要执行的代码,间隔时间)
			function foo()
			{
				setTimeout(function(){
					close();
				},10000);
			}
			
			var n = 10;
			function foo2()
			{
				if(n>0)
				{
					n = n - 1
					btn2.textContent = "倒数"+n+"s";
					setTimeout(foo2,1000);
				}
			}
		</script>
	</body>
</html>